<span onclick="ClickFunc(); return false;">Клик функция</span>
<script type="text/javascript">
var Glob_arr=new Array();
var index=-10;
function ClickFunc(){
Glob_arr.push(index);
index++;
alert(Glob_arr[0])
alert(index);
alert(this.index)
alert(window.index)
alert(this.index===index)
alert(window.index==index)
alert(this.index===window.index)
}
</script>